linux/drivers/parisc/eisa.c
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   1/*
   2 * eisa.c - provide support for EISA adapters in PA-RISC machines
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 *
   9 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
  10 * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>
  11 *
  12 * There are two distinct EISA adapters.  Mongoose is found in machines
  13 * before the 712; then the Wax ASIC is used.  To complicate matters, the
  14 * Wax ASIC also includes a PS/2 and RS-232 controller, but those are
  15 * dealt with elsewhere; this file is concerned only with the EISA portions
  16 * of Wax.
  17 * 
  18 * 
  19 * HINT:
  20 * -----
  21 * To allow an ISA card to work properly in the EISA slot you need to
  22 * set an edge trigger level. This may be done on the palo command line 
  23 * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with 
  24 * n and n2 as the irq levels you want to use.
  25 * 
  26 * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at 
  27 * irq levels 10 and 11.
  28 */
  29
  30#include <linux/init.h>
  31#include <linux/ioport.h>
  32#include <linux/interrupt.h>
  33#include <linux/kernel.h>
  34#include <linux/module.h>
  35#include <linux/pci.h>
  36#include <linux/spinlock.h>
  37#include <linux/eisa.h>
  38
  39#include <asm/byteorder.h>
  40#include <asm/io.h>
  41#include <asm/hardware.h>
  42#include <asm/processor.h>
  43#include <asm/parisc-device.h>
  44#include <asm/delay.h>
  45#include <asm/eisa_bus.h>
  46#include <asm/eisa_eeprom.h>
  47
  48#if 0
  49#define EISA_DBG(msg, arg... ) printk(KERN_DEBUG "eisa: " msg , ## arg )
  50#else
  51#define EISA_DBG(msg, arg... )  
  52#endif
  53
  54#define SNAKES_EEPROM_BASE_ADDR 0xF0810400
  55#define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400
  56
  57static DEFINE_SPINLOCK(eisa_irq_lock);
  58
  59void __iomem *eisa_eeprom_addr __read_mostly;
  60
  61/* We can only have one EISA adapter in the system because neither
  62 * implementation can be flexed.
  63 */
  64static struct eisa_ba {
  65        struct pci_hba_data     hba;
  66        unsigned long eeprom_addr;
  67        struct eisa_root_device root;
  68} eisa_dev;
  69
  70/* Port ops */
  71
  72static inline unsigned long eisa_permute(unsigned short port)
  73{
  74        if (port & 0x300) {
  75                return 0xfc000000 | ((port & 0xfc00) >> 6)
  76                        | ((port & 0x3f8) << 9) | (port & 7);
  77        } else {
  78                return 0xfc000000 | port;
  79        }
  80}
  81
  82unsigned char eisa_in8(unsigned short port)
  83{
  84        if (EISA_bus)
  85                return gsc_readb(eisa_permute(port));
  86        return 0xff;
  87}
  88
  89unsigned short eisa_in16(unsigned short port)
  90{
  91        if (EISA_bus)
  92                return le16_to_cpu(gsc_readw(eisa_permute(port)));
  93        return 0xffff;
  94}
  95
  96unsigned int eisa_in32(unsigned short port)
  97{
  98        if (EISA_bus)
  99                return le32_to_cpu(gsc_readl(eisa_permute(port)));
 100        return 0xffffffff;
 101}
 102
 103void eisa_out8(unsigned char data, unsigned short port)
 104{
 105        if (EISA_bus)
 106                gsc_writeb(data, eisa_permute(port));
 107}
 108
 109void eisa_out16(unsigned short data, unsigned short port)
 110{
 111        if (EISA_bus)   
 112                gsc_writew(cpu_to_le16(data), eisa_permute(port));
 113}
 114
 115void eisa_out32(unsigned int data, unsigned short port)
 116{
 117        if (EISA_bus)
 118                gsc_writel(cpu_to_le32(data), eisa_permute(port));
 119}
 120
 121#ifndef CONFIG_PCI
 122/* We call these directly without PCI.  See asm/io.h. */
 123EXPORT_SYMBOL(eisa_in8);
 124EXPORT_SYMBOL(eisa_in16);
 125EXPORT_SYMBOL(eisa_in32);
 126EXPORT_SYMBOL(eisa_out8);
 127EXPORT_SYMBOL(eisa_out16);
 128EXPORT_SYMBOL(eisa_out32);
 129#endif
 130
 131/* Interrupt handling */
 132
 133/* cached interrupt mask registers */
 134static int master_mask;
 135static int slave_mask;
 136
 137/* the trig level can be set with the
 138 * eisa_irq_edge=n,n,n commandline parameter 
 139 * We should really read this from the EEPROM 
 140 * in the furure. 
 141 */
 142/* irq 13,8,2,1,0 must be edge */
 143static unsigned int eisa_irq_level __read_mostly; /* default to edge triggered */
 144
 145
 146/* called by free irq */
 147static void eisa_disable_irq(unsigned int irq)
 148{
 149        unsigned long flags;
 150
 151        EISA_DBG("disable irq %d\n", irq);
 152        /* just mask for now */
 153        spin_lock_irqsave(&eisa_irq_lock, flags);
 154        if (irq & 8) {
 155                slave_mask |= (1 << (irq&7));
 156                eisa_out8(slave_mask, 0xa1);
 157        } else {
 158                master_mask |= (1 << (irq&7));
 159                eisa_out8(master_mask, 0x21);
 160        }
 161        spin_unlock_irqrestore(&eisa_irq_lock, flags);
 162        EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 163        EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 164}
 165
 166/* called by request irq */
 167static void eisa_enable_irq(unsigned int irq)
 168{
 169        unsigned long flags;
 170        EISA_DBG("enable irq %d\n", irq);
 171                
 172        spin_lock_irqsave(&eisa_irq_lock, flags);
 173        if (irq & 8) {
 174                slave_mask &= ~(1 << (irq&7));
 175                eisa_out8(slave_mask, 0xa1);
 176        } else {
 177                master_mask &= ~(1 << (irq&7));
 178                eisa_out8(master_mask, 0x21);
 179        }
 180        spin_unlock_irqrestore(&eisa_irq_lock, flags);
 181        EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 182        EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 183}
 184
 185static unsigned int eisa_startup_irq(unsigned int irq)
 186{
 187        eisa_enable_irq(irq);
 188        return 0;
 189}
 190
 191static struct hw_interrupt_type eisa_interrupt_type = {
 192        .typename =     "EISA",
 193        .startup =      eisa_startup_irq,
 194        .shutdown =     eisa_disable_irq,
 195        .enable =       eisa_enable_irq,
 196        .disable =      eisa_disable_irq,
 197        .ack =          no_ack_irq,
 198        .end =          no_end_irq,
 199};
 200
 201static irqreturn_t eisa_irq(int wax_irq, void *intr_dev)
 202{
 203        int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
 204        unsigned long flags;
 205        
 206        spin_lock_irqsave(&eisa_irq_lock, flags);
 207        /* read IRR command */
 208        eisa_out8(0x0a, 0x20);
 209        eisa_out8(0x0a, 0xa0);
 210
 211        EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n",
 212                   irq, eisa_in8(0x20), eisa_in8(0xa0));
 213   
 214        /* read ISR command */
 215        eisa_out8(0x0a, 0x20);
 216        eisa_out8(0x0a, 0xa0);
 217        EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n",
 218                 eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
 219        
 220        irq &= 0xf;
 221        
 222        /* mask irq and write eoi */
 223        if (irq & 8) {
 224                slave_mask |= (1 << (irq&7));
 225                eisa_out8(slave_mask, 0xa1);
 226                eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
 227                eisa_out8(0x62,0x20);   /* 'Specific EOI' to master-IRQ2 */
 228                
 229        } else {
 230                master_mask |= (1 << (irq&7));
 231                eisa_out8(master_mask, 0x21);
 232                eisa_out8(0x60|irq,0x20);       /* 'Specific EOI' to master */
 233        }
 234        spin_unlock_irqrestore(&eisa_irq_lock, flags);
 235
 236        __do_IRQ(irq);
 237   
 238        spin_lock_irqsave(&eisa_irq_lock, flags);
 239        /* unmask */
 240        if (irq & 8) {
 241                slave_mask &= ~(1 << (irq&7));
 242                eisa_out8(slave_mask, 0xa1);
 243        } else {
 244                master_mask &= ~(1 << (irq&7));
 245                eisa_out8(master_mask, 0x21);
 246        }
 247        spin_unlock_irqrestore(&eisa_irq_lock, flags);
 248        return IRQ_HANDLED;
 249}
 250
 251static irqreturn_t dummy_irq2_handler(int _, void *dev)
 252{
 253        printk(KERN_ALERT "eisa: uhh, irq2?\n");
 254        return IRQ_HANDLED;
 255}
 256
 257static struct irqaction irq2_action = {
 258        .handler = dummy_irq2_handler,
 259        .name = "cascade",
 260};
 261
 262static void init_eisa_pic(void)
 263{
 264        unsigned long flags;
 265        
 266        spin_lock_irqsave(&eisa_irq_lock, flags);
 267
 268        eisa_out8(0xff, 0x21); /* mask during init */
 269        eisa_out8(0xff, 0xa1); /* mask during init */
 270        
 271        /* master pic */
 272        eisa_out8(0x11,0x20); /* ICW1 */   
 273        eisa_out8(0x00,0x21); /* ICW2 */   
 274        eisa_out8(0x04,0x21); /* ICW3 */   
 275        eisa_out8(0x01,0x21); /* ICW4 */   
 276        eisa_out8(0x40,0x20); /* OCW2 */   
 277        
 278        /* slave pic */
 279        eisa_out8(0x11,0xa0); /* ICW1 */   
 280        eisa_out8(0x08,0xa1); /* ICW2 */   
 281        eisa_out8(0x02,0xa1); /* ICW3 */   
 282        eisa_out8(0x01,0xa1); /* ICW4 */   
 283        eisa_out8(0x40,0xa0); /* OCW2 */   
 284        
 285        udelay(100);
 286        
 287        slave_mask = 0xff; 
 288        master_mask = 0xfb; 
 289        eisa_out8(slave_mask, 0xa1); /* OCW1 */
 290        eisa_out8(master_mask, 0x21); /* OCW1 */
 291        
 292        /* setup trig level */
 293        EISA_DBG("EISA edge/level %04x\n", eisa_irq_level);
 294        
 295        eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge  */
 296        eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1); 
 297        
 298        EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 299        EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 300        EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0));
 301        EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1));
 302        
 303        spin_unlock_irqrestore(&eisa_irq_lock, flags);
 304}
 305
 306/* Device initialisation */
 307
 308#define is_mongoose(dev) (dev->id.sversion == 0x00076)
 309
 310static int __init eisa_probe(struct parisc_device *dev)
 311{
 312        int i, result;
 313
 314        char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
 315
 316        printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n", 
 317                name, dev->hpa.start);
 318
 319        eisa_dev.hba.dev = dev;
 320        eisa_dev.hba.iommu = ccio_get_iommu(dev);
 321
 322        eisa_dev.hba.lmmio_space.name = "EISA";
 323        eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
 324        eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
 325        eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
 326        result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
 327        if (result < 0) {
 328                printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
 329                return result;
 330        }
 331        eisa_dev.hba.io_space.name = "EISA";
 332        eisa_dev.hba.io_space.start = 0;
 333        eisa_dev.hba.io_space.end = 0xffff;
 334        eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
 335        result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
 336        if (result < 0) {
 337                printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
 338                return result;
 339        }
 340        pcibios_register_hba(&eisa_dev.hba);
 341
 342        result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev);
 343        if (result) {
 344                printk(KERN_ERR "EISA: request_irq failed!\n");
 345                return result;
 346        }
 347        
 348        /* Reserve IRQ2 */
 349        irq_to_desc(2)->action = &irq2_action;
 350        
 351        for (i = 0; i < 16; i++) {
 352                irq_to_desc(i)->chip = &eisa_interrupt_type;
 353        }
 354        
 355        EISA_bus = 1;
 356
 357        if (dev->num_addrs) {
 358                /* newer firmware hand out the eeprom address */
 359                eisa_dev.eeprom_addr = dev->addr[0];
 360        } else {
 361                /* old firmware, need to figure out the box */
 362                if (is_mongoose(dev)) {
 363                        eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
 364                } else {
 365                        eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
 366                }
 367        }
 368        eisa_eeprom_addr = ioremap_nocache(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
 369        result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space,
 370                        &eisa_dev.hba.lmmio_space);
 371        init_eisa_pic();
 372
 373        if (result >= 0) {
 374                /* FIXME : Don't enumerate the bus twice. */
 375                eisa_dev.root.dev = &dev->dev;
 376                dev->dev.driver_data = &eisa_dev.root;
 377                eisa_dev.root.bus_base_addr = 0;
 378                eisa_dev.root.res = &eisa_dev.hba.io_space;
 379                eisa_dev.root.slots = result;
 380                eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */
 381                if (eisa_root_register (&eisa_dev.root)) {
 382                        printk(KERN_ERR "EISA: Failed to register EISA root\n");
 383                        return -1;
 384                }
 385        }
 386        
 387        return 0;
 388}
 389
 390static const struct parisc_device_id eisa_tbl[] = {
 391        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
 392        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
 393        { 0, }
 394};
 395
 396MODULE_DEVICE_TABLE(parisc, eisa_tbl);
 397
 398static struct parisc_driver eisa_driver = {
 399        .name =         "eisa_ba",
 400        .id_table =     eisa_tbl,
 401        .probe =        eisa_probe,
 402};
 403
 404void __init eisa_init(void)
 405{
 406        register_parisc_driver(&eisa_driver);
 407}
 408
 409
 410static unsigned int eisa_irq_configured;
 411void eisa_make_irq_level(int num)
 412{
 413        if (eisa_irq_configured& (1<<num)) {
 414                printk(KERN_WARNING
 415                       "IRQ %d polarity configured twice (last to level)\n", 
 416                       num);
 417        }
 418        eisa_irq_level |= (1<<num); /* set the corresponding bit */
 419        eisa_irq_configured |= (1<<num); /* set the corresponding bit */
 420}
 421
 422void eisa_make_irq_edge(int num)
 423{
 424        if (eisa_irq_configured& (1<<num)) {
 425                printk(KERN_WARNING 
 426                       "IRQ %d polarity configured twice (last to edge)\n",
 427                       num);
 428        }
 429        eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
 430        eisa_irq_configured |= (1<<num); /* set the corresponding bit */
 431}
 432
 433static int __init eisa_irq_setup(char *str)
 434{
 435        char *cur = str;
 436        int val;
 437
 438        EISA_DBG("IRQ setup\n");
 439        while (cur != NULL) {
 440                char *pe;
 441                
 442                val = (int) simple_strtoul(cur, &pe, 0);
 443                if (val > 15 || val < 0) {
 444                        printk(KERN_ERR "eisa: EISA irq value are 0-15\n");
 445                        continue;
 446                }
 447                if (val == 2) { 
 448                        val = 9;
 449                }
 450                eisa_make_irq_edge(val); /* clear the corresponding bit */
 451                EISA_DBG("setting IRQ %d to edge-triggered mode\n", val);
 452                
 453                if ((cur = strchr(cur, ','))) {
 454                        cur++;
 455                } else {
 456                        break;
 457                }
 458        }
 459        return 1;
 460}
 461
 462__setup("eisa_irq_edge=", eisa_irq_setup);
 463
 464
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